Accession Number : AD0657300

Title :   LATENCY FOR SACCADIC EYE MOVEMENT,

Corporate Author : PSYCHOPHYSICS LAB UNIV OF WASHINGTON SEATTLE

Personal Author(s) : Saslow,M. G.

Report Date : 01 OCT 1966

Pagination or Media Count : 17

Abstract : Under carefully controlled conditions, in blocks of trials in which the stimulus displacement on any given trial is randomly selected from a group of two, four, or eight possible displacements, latency for lateral saccadic eye movement does not change. Moreover, a subject trained on such a disjunctive latency task, then presented with blocks of trials in which there is only one possible stimulus displacement, of probability 1.00, 0.75, 0.50, or 0.25, displays the same latency to that displacement as when it was embedded in one of the disjunctive sets. These results conflict with earlier assertions that knowledge of stimulus location determines saccade latency. When the saccade on each trial is under the control of the stimulus on that trial, the size of the set of possible stimulus displacements does not affect latency to a particular displacement. These results also suggest that previous estimates of saccade latency using single stimulus displacements were underestimates, because subjects were not previously trained to follow stimulus displacement in a disjunctive task. A certain amount of care is required if saccade latencies are to be attributed completely to control by stimulus factors. (Author)

Descriptors :   (*VISUAL PERCEPTION, *PSYCHOLOGICAL TESTS), (*EYE, MOTION), VISUAL SIGNALS, TIME, DECISION MAKING, REACTION(PSYCHOLOGY), PSYCHOPHYSICS, FACTOR ANALYSIS

Subject Categories : Psychology

Distribution Statement : APPROVED FOR PUBLIC RELEASE